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Material flow

About: Material flow is a research topic. Over the lifetime, 3050 publications have been published within this topic receiving 36844 citations. The topic is also known as: material stream.


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Journal ArticleDOI
TL;DR: In this paper, three promising multistage two-point incremental sheet forming (MTPIF) path strategies, i.e., parallel line strategy, variable angle strategy, and stretch-bend-assisted strategy, are selected to investigate the influence of tool paths on thickness distributions, material flow, and geometric error.
Abstract: Incremental sheet forming (ISF) has received increasing attention with its advantages of economy and flexibility for small batch sheet metal parts. However, the excessive thinning may be resulted at large forming angles for complex parts, which cannot meet the design requirements and seriously impedes the industrial application of ISF. Although the multistage incremental sheet forming (MISF) has been proposed to overcome the dilemma of excessive thinning in ISF, the design of the optimal strategy which can control material flow and improve thickness distribution is a critical issue. In this paper, three promising multistage two point incremental sheet forming (MTPIF) path strategies, i.e., parallel line strategy, variable angle strategy, and stretch-bend-assisted strategy, are selected to investigate the influence of tool paths on thickness distributions, material flow, and geometric error. Firstly, experimental thickness distributions of truncated pyramids formed with three path strategies and single-stage TPIF strategy are compared. Meanwhile, the theoretical models are introduced to illustrate the difference of thickness distributions both at the wall and the corner. Compared with single-stage TPIF strategy, MTPIF path strategies studied in this paper are effective to improve the thickness distribution of truncated pyramids at both the component wall and the corner. Through the theoretical analysis, it is found that the thickness distribution at the wall can be controlled by adjusting intermediate forming angles. Meanwhile, the intermediate shape in circumferential direction has significant influence on the thickness distribution for complex parts. Then, the material flows of three path strategies at different forming stages are analyzed. It is found that the materials at the flange as well as transition arcs are deformed into wall to increase the thickness distribution. Finally, considering both thickness distributions and geometric errors, the variable angle strategy is found as the effective MTPIF strategy for the studied process.

24 citations

Journal ArticleDOI
TL;DR: In this article, a detailed analysis of sheet metal extrusion with the finite element method is presented, where the mesh distortion, the field of material flow, and the distributions of the stress and strain can be predicted.

24 citations

Journal ArticleDOI
TL;DR: In this article, five tools with different pin-tip profiles (thread taper, triangular, square, three grooves, and conical platform) were used to friction stir weld 20mm-thick AA7075 alloy plates.
Abstract: Five tools with different pin-tip profiles like thread taper, triangular, square, three grooves, and conical platform were designed to friction stir weld 20-mm-thick AA7075 alloy plates The effects of pin-tip profiles on thermal cycles, material flow, and mechanical properties of the joints were studied The results show that the temperature greatly decreases from the top to the bottom of the weld, and higher peak temperatures along the thickness are obtained using three grooves tool Due to poor plastic flow reflected by local transfer behavior of material, thread taper and conical platform tools yield macro cross-sectional level pore defect on advancing side in nugget zone However, triangular, square, and three grooves tools produce defect-free joints due to improving plastic flow resulted from stronger pulsating action and stirring power, leading to higher transfer displacements of local material The tensile test results show that the joints fabricated by three grooves tool have better mechanical properties including strength and ductility owing to better material flow A higher ultimate tensile strength of 391 ± 10 MPa, yield strength of 310 ± 12 MPa, and elongation of 83 % are obtained, respectively This can be attributed to finer grains, greater natural aging response and optimum hardness

24 citations

Journal ArticleDOI
TL;DR: In this article, the authors focused on flexible filamentous particles in rotary dryers and chose tobacco particles as experimental material to investigate the bulk moment of particle and particle space time.

24 citations

Journal ArticleDOI
TL;DR: In this article, a value stream diagram of iron resources corresponding to the substance flow chart was plotted, based on the previous material flow analysis result of IR resources, the diagram quantitatively depicted the value of the circulating flow of IR in China in 2011.
Abstract: Iron is an important basic resource for national economic development in China. It is of great strategic importance for the sustainable development of China's economy to study the utilization and circulation status of iron resources. In this paper, using the material flow and value chain analysis method, we quantitatively analyzed the value flow of iron resources in China. According to the value chain and price theory of element M, a value stream diagram of iron resources corresponding to the substance flow chart was plotted. Based on the previous material flow analysis result of iron resources, the diagram quantitatively depicted the value of the circulating flow of iron resources in China in 2011. The results show that by recycling materials, the value of the circulating flow of iron resources can bring considerable economic benefits to both producers and consumers. In the production stage, the expenditures of the entire economic system was reduced by 91.77 billion RMB by circulating iron and the income increased by 95 billion RMB by recycling home scrap, which was generated in the crude steel production stage. In the use stage of iron and steel products, the recycling of old scrap enabled the entire economic system to recover 370.78 billion RMB. It should be noted that analysis within a single framework of physical and economic characteristics of iron resources in the economic system can further extend the research chain of substance flow and value flow at the macro level, enhancing the economic value of substances flow research. In addition, by tracking and depicting the value flow cycle of elements, the improvement potentials and the value situations can be determined to provide useful information for conducting processing and technological innovation for waste minimization.

24 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023120
2022221
2021110
2020139
2019174
2018167